Hydraulic chair.



M. HANSON. HYDRAULIC CHAIR.

APPLICATION FILED JULY 9, 1910,

9?'?,-786., Patented Dec.6,1910.

MARTIN HANSON, OF CHICAGO, ILLINOIS, ASSIGNOR TO LOUIS HANSON COMPANY, OF

CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

HYDRAULIC CHAIR.

Specification of Letters I'atent.

Patented Dec. 6, 1910.

To all whom it may concern:

Be it known that I, MARTIN HANSON, a citizen of the United States, residing at Chicago, county of Cook, and State of Illinois, have invented certain new and useful I mprovements in Hydraulic Chairs, of which the following is a specification, reference being had to the accompanying drawings, forming a part thereof.

The purpose of this invention is to provide an improved construction in hydraulic chairs.

It consists of features of construction shown and described as indicated in the claims.

In the drawings-Figure 1 is an axial section of the standard of a chair embodying this invention. Fig. 2 is a section at the line 2-2 on Fig. 1 Fig. 3 is a section at the line 3-3 on Fig. 1.

A portion-of this invention relates to the valve structure of the hydraulic chair illustrated. This will be first described.

1 is the standard orchair, within which the chair stem 2 is fitted for. reciprocation pistonwise, said chair stem being itself a hollow cylinder havin reciprocating within it the piston 3, whic ,is operated by connections, which need not be further described, for pumpingtheoil Orother liquid with which the standard is filled, for operating the chair in a manner well understood.

The lower end of the chair stem (which is substantially the pumpbarrel) is fitted with a downwardly opening upwardly seating check valve 4., held normally seated upwardly by a spring I4 for opening downwardly to permit the oil to be forced down through the ottom of the pump-barrel chair. stem, into the cavity of the standard, this being the means by which the chair. is elevated, as well understood. .V

The piston-valve device is constructed for performing two functions: First, theordinary function of a piston valve,that is, ofopening upwardly to' permit the liquid to pass up through the piston when the latter is forced downward for forcing the liquid out past the valve 4; and second, the function of opening to permit the liquid to pass 11 ward through the piston when the valve 4 is also opened, so that the liquid can escape from below the stem to permit the chair to descend. For the purpose of these two functions, the valve device in the piston 3 com permanently secured in the bottom of the piston, and has passa e through it for the movement of the liquid from one side to the other of the piston, terminating at the lower side of said valve-seating element in a port 6, which is closed by the upwardly seating valve 7 (hereinafter referred to as the main valve), said passage terminating at the upper side in a plurality of V orts, one of which is occupied by the stem 0 the valve 7, which fits into and closes said-"port, except in so far as passage is afforded throughsaid port by the axial a erture 8,wl1ichextends throu h said valve? and its stem, from end to en In the structure shown in the drawings, the remaining portage or passage through the valve seat 5 consists of the circular group of ports9, 9, which are arranged in a circle about the central port and stem of the valve 7. The upper end of the aperture 8, through thevalve 7 andits stem 7, is provided with a valve 10 (herein referred to as a supplemental valve having a stem 11, whic extends through the axial aperture 8, and at its lower end has coiled about it 'a relatively heavy spring 12, reacting between the lower end of the valve 7 and a stop'nut 13, screwed onto the end of the stem 11, such spring operating by relatively strong tension to ho d the valve lO seated upon the upper end of the stem of the valve l, and causing the two. valves to move as a unitary structure except under conditions causing the compression of the spring 12, as will be hereinafter explained. A relatively light spring 14 re.- acts between the valve 10,which has a flange 10 at its upper end for seating the spring,+-and the up er end of the valve seatingelement 5. uch 5 ring, it will be seen, acts to seat the valve lightly, according to the tension of the spring 14.

Upon consideration of this structure, it will be seen that in" the ordinary pumping action, the springs 4 and 14 will yield to permit the valves which they respectively control,-.-viz: the valves 4 and 7 ,-to open in the ordinary manner of pump valves, for assingthe liquid down into the chamber elow the valve 4, and this will occur in the case of any stroke of the piston which is not so deep as to cause the lower end of-the stem 11 of the valve 10 to force the valve 4 down to the limit of its stroke, so as to meet with the positive resistance-afforded by the rigid while the valve 10 will be also held open by =the stem 11 encountering the stem of the valve 4. Such deeper stroke of the piston will be given by the o erator whenit is desired to emit the chair to descend, because, by such ee er stroke, holding open both the valve 4 an the valve 10, a free passage upward will be provided for the liquid, which will be forced out of the chamber under the chair stem by the weight of the descending chair.

The means for reciprocating the piston, shown, comprises the rock shaft 15, having a short crank 16, connected by a pitman 17 with the stem 18 of the piston 3, and it will be seen that any means provided for rocking the shaft 15 may be operated either for giving the piston a short stroke, insufiicient for forcing up the valve 10, or the full length stroke foropeni-ng said valve.

I claim: v

1. In a hydraulic chair, a valve device for the purpose indicated, consisting of a valveseating element through which the flow of liquid is to be controlled, the liquid passage therethrough opening at one end of said element in a single port and at the other end in a plurality of ports; a main valve which closes the single port having astem which extends through one of the ports at the other end, said main valve and stem being apertured from end to end; a supplemental valve which closes said aperture of the main valve stem; a relatively strong spring which reacts between the two valves for holdin the supplemental valve seated, and a relatively light spring which reacts between said supplemental valve and said valve-seatingelement for holding the main valve seated.

2. In a hydraulic chair, avalve'device for the purpose indicated, consisting of a seating element through which the flow of liquid is to be controlled; a liquid passage therethrough opening bya single portat one end and by a plurality of ports at the other end;

a mam valve which closes the single port having a stem which occupies one of said plurality of ports, said main valve and its stem being axially apertured from end to end; a supplemental valve which closes the end of said axial aperture in the main valve stem, having a stem which extends through said axial aperture and. protrudes below the main valve stem; :1 stop on the protruding end of said stem; a relatively strong spring reacting between sald stop and themam valve for holding the supplemental valve ing between the supplemental va valve-seating element.

seated; and a relatively lightspring 'eacfi ve an sai I 3. In a hydrauhc chair, a valve device-for the urpose indicated, consisting of a valve} seating element through which the flow;-. of

liquid is to be controlled, having for such end to end; a supplemental valve which closes the upper end of said axial aperture, having a stem which extends down through said aperture and protrudes below the same;

a stop in said stem, and a relatively strong spring reacting between said stop and the lower end of the main valve for holding the supplemental valve seated, anda relatively light spring reactingbetween the supplemental valve and the upper end of the valveseating element. A

In testimony whereof, I have hereunto set my hand, at Chicago, Illinois, this' 6th day of July 1910.

MARTIN HANSON. Witnesses;

JEAN ELLIOTT, M. GERTRUDE Am. 

